Église Saint-Jean-des-Grésillons de Gennevilliers, church building in Gennevilliers, France

Église Saint-Jean-des-Grésillons is a rectangular modern church without a bell tower, built in 1921 and restored by the Œuvre des Chantiers du Cardinal in 1960. Its pale beige facade carries the inscription "St Jean" and a tall narrow window with a dark grid, topped by a slender cross; a red tiled gable roof with small dormers sits above, and a curving annex with three rectangular windows and a flat canopy on columns extends to the left.

A wooden chapel stood here in the 19th century, when the Grésillons plain was farmland and ragpickers' camps. A new building was erected in 1921 and restored in 1960 by the Œuvre des Chantiers du Cardinal. The parish ran social works until the 1950s, and in 1947 it founded the children's choir Les Petits Rossignols.

The parish choir, the Chorale du Christ Roi, sings at the 9:30 Sunday Mass. The parish was long active in social work, a role deliberately reduced in the 1950s. In 1947 the children's choir Les Petits Rossignols was founded here, becoming Les Petits Chanteurs d'Asnières in 1958 under Jean Amoureux.

The church stands at 17, rue du 19 mars 1962, with the tree-lined coulée verte Missak-Manouchian running along one side. Sunday mass is at 9:30 a.m., sung by the Chorale du Christ Roi. Parish rooms and a first-floor Foyer d'accueil adjoin the building.

The 14 Stations of the Cross were drawn by Ghislain d'Orglandes in spring 2024, and parishioners posed for the figures of the Passion. The altar and the luminous cross on the brick wall were made by André Gence, a priest of the Mission de France.